<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>多列布局</title>
    <style>
        .two-column-layout{
            display: flex;
            height: 400px;
            width: 400px;
        }
        .left{
            width: 100px;
            background-color: red;
        }
        .right{
            flex: 1;
            background-color: #33cc99;
        }
    </style>
</head>
<body>
    <div class="two-column-layout">
        <div class="left"></div>
        <div class="right"></div>
    </div>
</body>
</html>